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XRD patterns of (a) soil, (b) fly ash and (c) GGBS. Q: quartz (ICDD reference: 00-046-1045); K: kaoline (ICDD reference: 00-029-1488); Hm: hematite (ICDD reference: 00-024-0072); G: gypsum (ICDD reference: 00-037-1496); A: anhydrite (ICDD reference: 00-037-1496, 01-086-2270); Ak: akermanite (ICDD reference: 00-035-0592); Ca: calcite (ICDD reference: 01-089-0387).
